Feet Per Second to MPH Converter
Convert feet per second to miles per hour — divide by about 1.467. Results update as you type; exact factors shown.
One foot per second is 0.6818 miles per hour — see the exact factor, not a rounded rule of thumb.
How the feet per second to mph converter works
Speeds convert through metres per second. 1 km/h is 1000/3600 m/s; 1 mph is 1609.344/3600 m/s; a knot is one nautical mile (1,852 m) per hour. Mach is shown against the standard sea-level speed of sound of 340.29 m/s and varies with altitude and temperature.
The UK is metric for most trade and science but keeps miles, pints, stone and mpg (with the imperial gallon) in daily life.
Common speed conversions
| From | To | Units |
|---|---|---|
| 1 ft/s | 0.6818 mph | foot per second to miles per hour |
| 5 ft/s | 3.4091 mph | feet per second to miles per hour |
| 10 ft/s | 6.8182 mph | feet per second to miles per hour |
| 22 ft/s | 15 mph | feet per second to miles per hour |
| 44 ft/s | 30 mph | feet per second to miles per hour |
| 50 ft/s | 34.0909 mph | feet per second to miles per hour |
| 88 ft/s | 60 mph | feet per second to miles per hour |
| 100 ft/s | 68.1818 mph | feet per second to miles per hour |
| 147 ft/s | 100.2273 mph | feet per second to miles per hour |
| 200 ft/s | 136.3636 mph | feet per second to miles per hour |
| 500 ft/s | 340.9091 mph | feet per second to miles per hour |
| 1,116 ft/s | 760.9091 mph | feet per second to miles per hour |
Units in this converter and their exact factors
| Unit | Symbol | One unit in metre per seconds |
|---|---|---|
| metre per second | m/s | 1 metre per second |
| kilometre per hour | km/h | 0.2777777778 metre per second |
| mile per hour | mph | 0.44704 metre per second |
| knot | kn | 0.5144444444 metre per second |
| foot per second | ft/s | 0.3048 metre per second |
| Mach (sea level, 15 °C) | Ma | 340.29 metre per second |
FAQFrequently asked questions about speed conversion
What is 88 ft/s in mph?
Exactly 60 mph.
How do I convert quickly?
Multiply by 15/22, or about 0.682.
What is the speed of sound in ft/s?
About 1,116 ft/s at 20 °C, which is 761 mph.
Why do ballistics use ft/s?
Because muzzle velocities are large and the numbers stay readable — 3,000 ft/s rather than 2,045 mph.
What is a fast pitch in mph?
A 100 mph fastball is 147 ft/s.
Where these figures come from
- BIPM — The International System of Units (SI Brochure, 9th edition) — definitions of the base and derived units.
- NIST Special Publication 811 — Guide for the Use of the International System of Units — the exact conversion factors used here.
- National Physical Laboratory (NPL) — United Kingdom's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.